运用单帧单曝光图像法(SFSEI)对圆管射流的卷吸结构进行了图像可视化研究.单帧单曝光图像法不同于粒子图像测速法(PIV),它是采用相对较长的单次曝光进行拍摄以获得示踪粒子的运动轨迹.实验记录了从射流开始到观测区域内卷吸的形成过程.流场图像的空间大小为6.36 mm×3.97 mm,空间分辨率达到5.3μm×5.3μm.图像记录了射流卷吸产生的精细涡结构,其尺寸分布从几十微米到几百微米.本文的实验结果有助于理解射流的卷吸机理,也表明单帧单曝光图像法可以应用于观测微米级的流动结构.
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